From d609264a006a2fce77a9991aa55bb152d3418a2a Mon Sep 17 00:00:00 2001
From: Nicolas Williams <nico@twosigma.com>
Date: Tue, 6 Dec 2016 16:39:04 -0600
Subject: [PATCH] Only rm pidfile if PID matches

---
 lib/roken/write_pid.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/roken/write_pid.c b/lib/roken/write_pid.c
index 4ebdcae45..308e17696 100644
--- a/lib/roken/write_pid.c
+++ b/lib/roken/write_pid.c
@@ -77,11 +77,12 @@ pid_file_delete(char **filename)
 }
 
 static char *pidfile_path;
+static pid_t pidfile_pid;
 
 static void
 pidfile_cleanup(void)
 {
-    if (pidfile_path != NULL)
+    if (pidfile_path != NULL && pidfile_pid == getpid())
 	pid_file_delete(&pidfile_path);
 }
 
@@ -103,6 +104,7 @@ pidfile(const char *bname)
     if (bname == NULL)
 	bname = getprogname();
     pidfile_path = pid_file_write(bname);
+    pidfile_pid = getpid();
 #if defined(HAVE_ATEXIT)
     if (pidfile_path != NULL)
         atexit(pidfile_cleanup);